Arduino-esp32: digtalWrite to PIN 34 and 35 not working

[leonyuhanov]

Is there something special that needs to be done to get GPIO pin 34 and 35 to work as DIGITAL WRITE pins?

byte pinNum = 34;
void setup() 
{
  pinMode(pinNum, OUTPUT);
}
void loop() 
{
  digitalWrite(pinNum, HIGH);   
  delay(100);                      
  digitalWrite(pinNum, LOW);   
  delay(50);
}

The above code does not work for pins 34 and 35. All other pins work fine. I have tried several boards.
I have one of these LuaNode ESP32 Dev Board

[copercini]

These pins are input only.
page 4 of https://espressif.com/sites/default/files/documentation/esp_wroom_32_datasheet_en.pdf